/* layout */
.column {
    overflow: hidden;
}
.column-left {
    height:600px;
    position: relative;
    float: left;
}
.column-right {
    box-sizing: border-box;
    overflow: hidden;
}
.resize-save {
    position: absolute;
    top: 0;
    right: 5px;
    bottom: 0;
    left: 0;
    padding: 16px;
    overflow-x: hidden;
}
.resize-bar {
    width: 200px;
    height: inherit;
    resize: horizontal;
    cursor: ew-resize;
    opacity: 0;
    overflow: scroll;
}
/* 拖拽线 */
.resize-line {
    position: absolute;
    right: 0;
    top: 0;
    bottom: 0;
    border-right: 2px solid #eee;
    border-left: 1px solid #bbb;
    pointer-events: none;
}
.resize-bar:hover~.resize-line,
.resize-bar:active~.resize-line {
    border-left: 1px dashed skyblue;
}
.resize-bar::-webkit-scrollbar {
    width: 200px;
    height: inherit;
}
/* Firefox只有下面一小块区域可以拉伸 */
@supports (-moz-user-select: none) {

    .resize-bar:hover~.resize-line,
    .resize-bar:active~.resize-line {
        border-left: 1px solid #bbb;
    }

    .resize-bar:hover~.resize-line::after,
    .resize-bar:active~.resize-line::after {
        content: '';
        position: absolute;
        width: 16px;
        height: 16px;
        bottom: 0;
        right: -8px;
        background-size: 100% 100%;
    }
}
/* content */
.tab {
    float: left;
}
.div_btn {
    border: 1px solid burlywood;
    margin-left: 5px;
    width: 120px;
    border-radius: 5px;
    text-align: center;
    cursor: pointer;
    float: left;
}
/**选中的tab*/
.div_btn_choose {
    background-color: #e8e8de;
}